Rocket fuel is a liquid or solid fuel and an oxidizer.
Once the rocket engine is ignited, the propellant (liquid or solid fuel and oxidizer) burns in the engine's combustion chamber, producing a large amount of high-pressure gas that is ejected from the rocket engine ; the engine nozzle at high speed, which affects the rocket. The reaction force causes the rocket to move in the opposite direction of the gas jet.
Solid propellant burns quickly from the bottom layer to the top layer or from the inner layer to the outer layer, while liquid propellant uses high-pressure gas to pressurize the fuel and oxidizer tanks , then uses a turbine pump. to mix fuel and oxidizer. The oxidizer is further pressurized and delivered into the combustion chamber. The chemical energy of the propellant is converted into the kinetic energy of the gas in the engine, forming ahigh-speed airflow and ejecting it to generate thrust.
Detailed information:
Main categories
1 Divided according to levels
Can be divided into. There are two types of single-stage rockets and multi-stage rockets. Since it is difficult for single-stage rockets to achieve the cosmic speed necessary for space flight in practical applications, multi-stage rockets are needed to solve this problem. The first substage of the multistage rocket begins to work after launch and ignition, after the work is completed, it separates from the entire rocket. The second substage continues to push the payload into space, and so on, until the multistage rocket begins operating. the payload is sent into the predetermined orbit.
2. According to electric energy
According to electric energy, it is divided into energy rocketschemical energy, electrical energy rockets, nuclear energy rockets, solar rockets and photon rockets. At present, the most commonly used rocket is chemical energy rocket, which is divided into liquid propellant rocket, solid propellant rocket and solid-liquid mixed propellant rocket. As a representative of new energy rockets, the advantage of nuclear energy rockets is that the specific impulse of their engine is higher than that of chemical energy rockets.
Baidu Encyclopedia-Rocket
1. Lifting water by wind:
Lifting by wind power has been widely used since ancient times.
2. Wind power generation:
Wind power generation generally has three modes of operation:
(1) It is an independent mode of operation, usually a small generator. is used to produce electricity. One or more households provide electricity, which usesuse batteries to store energy to ensure energy consumption when there is no wind.
(2) Wind power generation is combined with other power generation methods (such as diesel engine power generation) to provide electricity to a unit, a village or an island.
(3) Wind energy production is integrated into the conventional electricity grid to supply the large electricity grid. Often, dozens or even hundreds of wind turbines are installed in a wind farm, which is the main development direction of wind power generation.
3. Sail to aid navigation:
In the development of today's motorboats, in order to save fuel and increase speed, ancient sails have been developed.
4. Wind heating:
With the improvement of people's living standards, the demand for thermal energy for home energyique is increasing, particularly in high latitudes of Europe and North America. Drinking water is a large consumer of energy. In order to meet the thermal energy needs of households and small-scale industries, wind heating has been considerably developed.
Detailed information:
Advantages and disadvantages of wind energy
1 Advantages
Wind energy is. clean energy source. Wind installations have become more advanced, mass production has reduced costs, and in the right places, wind power is now cheaper than other generators. Wind turbine installations are mostly non-three-dimensional installations that can protect land and ecology. Wind energy is a renewable, clean and environmentally friendly energy source. Wind power is energy efficient and environmentally friendly.
2. Disadvantages
The ecological problem with wind energy is that it can disturb birds. For example, grouse in Kansas, USA, gradually disappeared after the emergence of wind turbines. The current solution consists of producing electricity at sea, which is more expensive but also more efficient.
In some regions, the profitability of wind energy production is insufficient and the wind is intermittent in many regions. What's worse is that in places like Taiwan, there is less wind in summer and during the day. When energy demand is high, one must wait for the development of energy storage technologies such as compressed air.
Wind power generation requires a large amount of land to build wind farms to produce relatively large amounts of energy.
When wind power is generated, the wind turbine will make a lot of noise, it istherefore necessary to find an open space to build.
Current wind production is not yet mature and there is still considerable room for development.
Baidu Encyclopedia - Wind energy
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